Protestantism is a restoration of Christianity that you guys corrupted.
Corrupted? What kind of Holy Spirit is lazy enough to allow that to happen, and to need someone like Luther or Calvin to "restore" what never could have been lost in the first place?
Besides, the more you study the Fathers, the further back you have to place that "corruption," until you finally have to assert that the church was corrupted before the last Apostle was stiff and cold. And that's just craziness.